xmldom: XML injection via unsafe CDATA serialization allows attacker-controlled markup insertion

MITRE NVD CVE.ORG Print: PDF PDF

Summary

CVECVE-2026-34601
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-02 18:16:31 UTC
Updated2026-04-02 18:16:31 UTC
Descriptionxmldom is a pure JavaScript W3C standard-based (XML DOM Level 2 Core) `DOMParser` and `XMLSerializer` module. In xmldom versions 0.6.0 and prior and @xmldom/xmldom prior to versions 0.8.12 and 0.9.9, xmldom/xmldom allows attacker-controlled strings containing the CDATA terminator ]]> to be inserted into a CDATASection node. During serialization, XMLSerializer emitted the CDATA content verbatim without rejecting or safely splitting the terminator. As a result, data intended to remain text-only became active XML markup in the serialized output, enabling XML structure injection and downstream business-logic manipulation. This issue has been patched in xmldom version 0.6.0 and @xmldom/xmldom versions 0.8.12 and 0.9.9.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Problem Types: CWE-91 | CWE-91 CWE-91: XML Injection (aka Blind XPath Injection)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Xmldom Xmldom affected xmldom <= 0.6.0 Not specified
CNA Xmldom Xmldom affected @xmldom/xmldom < 0.8.12 Not specified
CNA Xmldom Xmldom affected @xmldom/xmldom >= 0.9.0, < 0.9.9 Not specified

References

ReferenceSourceLinkTags
github.com/xmldom/xmldom/security/advisories/GHSA-wh4c-j3r5-mjhp [email protected] github.com
github.com/xmldom/xmldom/commit/2b852e836ab86dbbd6cbaf0537f584dd0b5ac184 [email protected] github.com
github.com/xmldom/xmldom/releases/tag/0.9.9 [email protected] github.com
github.com/xmldom/xmldom/releases/tag/0.8.12 [email protected] github.com
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